Is "Ronseal High Performance Wood Filler" any good - or alternatives?

I need to make some window cills look better (and various similar
repairs), is "Ronseal High Performance Wood Filler" good for this sort
of job or are there better (cheaper?) alternatives?
I don't need anything particularly strong, just weatherproof and easy
to use.

Certainly IME the 2 part fillers are better than a one part filler for
external use.
Woodfiller, car body filler etc. they all seem to be basically the same
thing. I used car body filler the last time as I had a big tub around.

It seems to be very good to me. It may seem expensive but a little bit can go a
long way. In fact, given
how sticky it is, it has a tendency to go to all sorts of places you don't want
it to(!), so take care when
mixing etc.
You have to get pretty organised with it though as it goes off very quickly (10
mins or so).
On the plus side, it bonds to the wood well and is easy to sand and paint once
set.
I suspect that all the alternatives are pretty much the same thing (unless
anyone here knows better) so
would buy on cost and convenience in future.

Works well for me too. The only problem I've had is lifting when water gets
under the edge of a shallow fill, but that's not really Ronseal's fault.
Use rot killer and wood hardener on the good(ish) wood beneath.
If you're filling a deep hole, embed bits of scrap wood to save cost.
Does anyone understand how the Ronseal hardener works? I have difficulty
understanding how the small amount of kneading I am able to do before it sets
makes that little strip permeate the whole mass. Some sort of chain reaction?
Chris

I've only tried it once - on a Magnet window sill which had a patch of
rot. Dug out what I could and used the hardener. Then their filler. It
came loose a couple of years later - although a sill is probably the
biggest challenge. To be perfectly honest cutting out the rot and letting
in new wood is not only cheaper but doesn't take that much longer. And
lasts at least as well. ;-)

Yes it is excellent for this application. There are cheaper two part
fillers about that also work well though. There is quite a variation on
price of the Ronseal as well, so worth shopping about. They sometimes do
tins with 50% extra free or some such deal.

Well its that... it fills deep holes and goes off fast (you only have
about 5 - 10 mins of working time depending on temperature). It sands
quite nicely as well.

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